WO2020215415A1

WO2020215415A1 - <u /><u /><u /><u />PERIPHERAL CIRCUIT STRUCTURE OF OLED DISPLAY PANEL AND OLED DISPLAY PANEL

Info

Publication number: WO2020215415A1
Application number: PCT/CN2019/087616
Authority: WO
Inventors: 崔耀晨
Original assignee: 武汉华星光电半导体显示技术有限公司
Priority date: 2019-04-23
Filing date: 2019-05-20
Publication date: 2020-10-29
Also published as: CN109994534B; CN109994534A

Abstract

The present invention provides a peripheral circuit structure of an OLED display panel, and an OLED display panel. The peripheral circuit structure of the OLED display panel comprises a substrate, an insulation layer provided on the substrate, and a wire provided on the insulation layer; the substrate comprises a display region and a frame region surrounding the display region, the wire is located within the frame region, a plurality of grooves arranged at intervals are formed in a region in which the insulation layer corresponds to the wire, and the wire fills the plurality of grooves; providing the grooves below the wire, and filling the wire into the grooves can increase the cross-sectional area of the wire and reduce the impedance voltage drop of the wire, thereby improving the display effect of the OLED display panel, and improving the unevenness of brightness.

Description

Peripheral circuit structure of OLED display panel and OLED display panel

Technical field

The present invention relates to the field of display technology, in particular to a peripheral circuit structure of an OLED display panel and an OLED display panel.

Background technique

Organic light-emitting diode display devices also have excellent characteristics such as self-luminescence, no backlight, high contrast, thin thickness, wide viewing angle, fast response speed, can be used for flexible panels, wide operating temperature range, simple structure and manufacturing process, etc. It is considered as the emerging application technology of the next generation flat panel display.

An OLED display device usually includes: a substrate, an anode provided on the substrate, a hole injection layer provided on the anode, a hole transport layer provided on the hole injection layer, a light emitting layer provided on the hole transport layer, a device An electron transport layer on the light-emitting layer, an electron injection layer on the electron transport layer, and a cathode on the electron injection layer. The light-emitting principle of OLED display devices is that semiconductor materials and organic light-emitting materials are driven by an electric field to cause light emission through carrier injection and recombination.

Specifically, OLED display devices usually use ITO pixel electrodes and metal electrodes as the anode and cathode of the device, respectively. Under a certain voltage drive, electrons and holes are injected from the cathode and anode to the electron transport layer and hole transport layer, respectively. Holes migrate to the light-emitting layer through the electron transport layer and the hole transport layer respectively, and meet in the light-emitting layer to form excitons and excite light-emitting molecules. The latter emit visible light through radiation relaxation.

In the existing OLED display device, in order to provide a low voltage (VSS) to the cathode, a circle of cathode traces arranged around the display area is formed in the frame area of the substrate. The cathode traces are electrically connected to the drive IC (Drive IC). It can be connected to the driver chip to receive the low voltage power from the driver chip and transmit it to the cathode to drive the OLED in the display area to emit light. With the development of display technology, consumers have higher and higher requirements for the width of the display frame. Frames and borderless display panels have gradually become the mainstream, and the impedance drop of the cathode traces in the frame area (IR drop) will cause the position of the cathode traces close to the driver chip to be different from the position far away from the driver chip. The current common solution is to reduce the impedance by increasing the width of the cathode trace or the thickness of the metal film, but this will increase the frame width of the display panel, which does not meet the current narrow frame requirements, and increases the metal film. The thickness conflicts with the existing process capability.

technical problem

The purpose of the present invention is to provide a peripheral circuit structure of an OLED display panel, which can reduce the impedance voltage drop of the wiring in the peripheral circuit, improve the display effect of the OLED display panel, and improve uneven brightness.

The object of the present invention is also to provide an OLED display panel, which can reduce the impedance voltage drop of the wiring in the peripheral circuit, improve the display effect of the OLED display panel, and improve the uneven brightness.

Technical solutions

To achieve the above objective, the present invention provides a peripheral circuit structure of an OLED display panel, which includes a substrate, an insulating layer provided on the substrate, and wiring provided on the insulating layer;

The substrate includes a display area and a frame area surrounding the display area, the wiring is located in the frame area, the insulating layer and the area corresponding to the wiring are formed with a plurality of grooves arranged at intervals, so The wiring fills the plurality of grooves.

The extending direction of the groove is parallel to the extending direction of the wire, and the plurality of grooves are arranged at intervals in a direction perpendicular to the extending direction of the wire.

The depth of the groove is 0.8 to 1.2 μm, the width is 2 to 3 μm, and the taper angle is 40 to 50°.

It also includes a planarization layer provided on the insulating layer and a portion of the trace on the side close to the display area, an auxiliary connection line provided on the planarization layer and the trace, and the auxiliary connection line On the first electrode.

The material of the wiring and the first electrode is metal, and the material of the auxiliary connecting line is a transparent conductive material.

The line width of the auxiliary connecting line is greater than the line width of the routing line.

It also includes a driving chip arranged on one side of the substrate and electrically connected with the wiring.

The wiring is arranged around the display area, and both ends of the wiring are electrically connected to the driving chip.

The driving chip provides a low power supply voltage to the wiring.

The present invention also provides an OLED display panel including the peripheral circuit structure of the OLED display panel according to any one of claims 1 to 9.

Beneficial effect

Beneficial effects of the present invention: the present invention provides a peripheral circuit structure of an OLED display panel, including a substrate, an insulating layer provided on the substrate, and wiring provided on the insulating layer; the substrate includes a display area And a frame area surrounding the display area, the wiring is located in the frame area, the insulating layer and the area corresponding to the wiring are formed with a plurality of grooves arranged at intervals, and the wiring fills the In the multiple grooves, by setting grooves under the wires and filling the wires into the grooves, the cross-sectional area of the wires can be increased, the impedance voltage drop of the wires can be reduced, and the display effect of the OLED display panel can be improved , Improve uneven brightness. The invention also provides an OLED display panel, which can reduce the impedance voltage drop of the wiring in the peripheral circuit, improve the display effect of the OLED display panel, and improve the uneven brightness.

Description of the drawings

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. However, the accompanying drawings are only provided for reference and illustration and are not used to limit the present invention.

In the attached picture,

1 is a schematic diagram of wiring in the peripheral circuit structure of the OLED display panel of the present invention;

Fig. 2 is a cross-sectional view at A-A in Fig. 1.

Embodiments of the invention

In order to further explain the technical means adopted by the present invention and its effects, the following describes in detail the preferred embodiments of the present invention and the accompanying drawings.

1 to FIG. 2, the present invention provides a peripheral circuit structure of an OLED display panel, including a substrate 10, an insulating layer 20 provided on the substrate 10, and wiring 30 provided on the insulating layer 20;

The substrate 10 includes a display area 11 and a frame area 12 surrounding the display area 11. The wiring 30 is located in the frame area 12, and the insulating layer 20 and the area corresponding to the wiring 30 are spaced apart A plurality of grooves 21 are arranged, and the wiring 30 fills the plurality of grooves 21.

Specifically, the extending direction of the groove 21 is parallel to the extending direction of the wire 30, and the plurality of grooves 21 are arranged at intervals in a direction perpendicular to the extending direction of the wire 30.

Optionally, as shown in FIG. 2, the depth D of the groove 21 is 0.8-1.2 μm, the width W is 2-3 μm, and the taper angle C is 40-50°.

Specifically, the peripheral circuit structure of the OLED display panel further includes a planarization layer 40 provided on the insulating layer 20 and a portion of the wiring 30 on the side close to the display area 11, and a planarization layer 40 provided on the planarization layer. 40 and the auxiliary connection line 50 on the wiring 30 and the first electrode 60 provided on the auxiliary connection line 50.

Further, the film layer of the OLED display panel includes a first metal layer on a substrate, a gate insulating layer on the first metal layer, a semiconductor layer on the gate insulating layer, a gate insulating layer and a semiconductor layer. An interlayer insulating layer on the layer, a second metal layer on the interlayer insulating layer, a flat layer on the second metal layer and the interlayer insulating layer, and an OLED layer on the flat layer, wherein The first metal layer is formed with a gate electrode and a gate line, the second metal layer forms a source electrode, a source electrode line, and a drain electrode, and the OLED layer includes an anode, a light-emitting layer, and a cathode stacked in sequence. Corresponding to the peripheral circuit structure of the OLED display panel of the present invention, the gate insulating layer and the interlayer insulating layer together form the insulating layer 20, the wiring 30 is located in the second metal layer, and the auxiliary connecting line 50 is connected to the The anodes are arranged in the same layer, and the first electrode 60 is the cathode.

Optionally, the material of the wiring 30 and the first electrode 60 is metal, and the material of the auxiliary connecting line 50 is a transparent conductive material.

Specifically, the line width of the auxiliary connecting line 50 is greater than the line width of the wiring 30, and further, by making the edge of the auxiliary connecting line 50 close to the display area 11 beyond the wiring 30 and close to the line 30 The edge of the display area 11 is such that the line width of the auxiliary connecting line 50 is larger than the line width of the wiring 30 while maintaining the narrow frame of the OLED display panel.

Specifically, the peripheral circuit structure of the OLED display panel further includes a driving chip 70 arranged on one side of the substrate 10 and electrically connected to the wiring 30. Further, the wiring 30 surrounds the display area. 11, and both ends of the wiring 30 are electrically connected to the driving chip 70.

Specifically, the driving chip 70 provides the power supply low voltage VSS to the wiring.

For example, when the current 6-inch OLED display panel is working in the maximum brightness state, the total current on the trace 30 can reach about 300mA, the line width of the trace 30 is about 300um, and the sheet resistance is about 0.05Ω/sq. It can be calculated that the voltage drop between the side of the trace 30 close to the driver chip 70 and the side far from the driver chip 70 in the maximum brightness state can reach about 2V (the power supply low voltage VSS is -4V under normal working conditions, and the power supply high voltage VDD is 4.6V), so the brightness cannot reach 23%. The invention is applied to the OLED display panel, and 80 openings are added under the trace 30 with a width of 2.5um, a depth of 1um, and a taper angle (taper ) For the 45° groove 21, the cross-sectional area of the trace 30 can be expanded by 23%, and the corresponding voltage drop can be reduced by 0.38V, which can reduce the uneven brightness caused by the voltage drop to 18.8%, and the improvement effect is obvious, and there is no need to increase In the case of process flow and film thickness.

Based on the above-mentioned peripheral circuit structure of the OLED display panel, the present invention also provides an OLED display panel including the above-mentioned peripheral circuit structure of the OLED display panel.

In summary, the present invention provides a peripheral circuit structure of an OLED display panel, which includes a substrate, an insulating layer provided on the substrate, and wiring provided on the insulating layer; the substrate includes a display area and A frame area surrounding the display area, the wiring is located in the frame area, the insulating layer and the area corresponding to the wiring are formed with a plurality of grooves arranged at intervals, and the wiring fills the multiple grooves. A groove. By setting a groove under the trace and filling the trace into the groove, the cross-sectional area of the trace can be increased, the impedance voltage drop of the trace can be reduced, and the display effect of the OLED display panel can be improved. Uneven brightness. The invention also provides an OLED display panel, which can reduce the impedance voltage drop of the wiring in the peripheral circuit, improve the display effect of the OLED display panel, and improve the uneven brightness.

As mentioned above, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical solutions and technical ideas of the present invention, and all these changes and modifications shall fall within the protection scope of the claims of the present invention. .

Claims

A peripheral circuit structure of an OLED display panel, comprising a substrate, an insulating layer provided on the substrate, and wiring provided on the insulating layer;

The substrate includes a display area and a frame area surrounding the display area, the wiring is located in the frame area, the insulating layer and the area corresponding to the wiring are formed with a plurality of grooves arranged at intervals, so The wiring fills the multiple grooves.
The peripheral circuit structure of the OLED display panel of claim 1, wherein the extending direction of the groove is parallel to the extending direction of the wiring, and the plurality of grooves are perpendicular to the extending direction of the wiring The directions are arranged at intervals.
The peripheral circuit structure of the OLED display panel of claim 1, wherein the depth of the groove is 0.8-1.2 μm, the width is 2-3 μm, and the taper angle is 40-50°.
The peripheral circuit structure of the OLED display panel of claim 1, further comprising a planarization layer provided on the insulating layer and a portion of the traces on the side close to the display area, provided on the planarization layer and The auxiliary connection line on the trace and the first electrode arranged on the auxiliary connection line.
8. The peripheral circuit structure of the OLED display panel according to claim 4, wherein the material of the trace and the first electrode is metal, and the material of the auxiliary connecting line is a transparent conductive material.
8. The peripheral circuit structure of the OLED display panel of claim 4, wherein the line width of the auxiliary connecting line is greater than the line width of the wiring.
8. The peripheral circuit structure of the OLED display panel of claim 1, further comprising a driving chip provided on one side of the substrate and electrically connected to the wiring.
8. The peripheral circuit structure of the OLED display panel of claim 7, wherein the wiring is arranged around the display area, and both ends of the wiring are electrically connected to the driving chip.
7. The peripheral circuit structure of the OLED display panel according to claim 7, wherein the driving chip provides a low power supply voltage to the wiring.
An OLED display panel, comprising the peripheral circuit structure of the OLED display panel according to claim 1.